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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93014332d6fbbf401aac6fb39375aa75c57b182bf8bf815c5624d33680ec41b9' 
  AND token = 'y9JC6w4r18OOkG8WdFTOVwaT8PnH2MfkM9phdnsKg+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}